set light position from script
Again, you can see all the properties equivalents in Python by hovering over the light properties fields you want to change via Python scripting. 

For example, 

lamp = bpy.data.lamps['Lamp']
lamp.energy = 10  # 10 is the max value for energy
lamp.type = 'POINT'  # in ['POINT', 'SUN', 'SPOT', 'HEMI', 'AREA']
lamp.distance = 100


The simpler is to first change their values by hand, before to find the values you need and set them via Python.